| Family: |
Rivulidae (Rivulines), subfamily: Rivulinae |
| Max. size: |
2.46 cm SL (male/unsexed); 2.19 cm SL (female) |
| Environment: |
benthopelagic; freshwater |
| Distribution: |
South America: Santana River drainage, upper Paraguay River basin in Brazil. |
| Diagnosis: |
Dorsal soft rays (total): 8-9; Anal soft rays: 12-13; Vertebrae: 30-30. Diagnosed from all other congeners of the subgenus Melanorivulus in possessing 2+1 mandibular neuromasts. Differs from all species of Melanorivulus, except Rivulus violaceus by its caudal peduncle in both sexes with dark purplish gray spots and humeral region in males with a bright greenish blue blotch. Can be separated from Rivulus violaceus by having fewer dorsal-fin rays 8-9 (vs. 10-11) and fewer anal-fin rays 11-13 (vs. 14-15). Additional characters helpful in the identification of this species include: scales in the longitudinal series 30-31; flank with close red dots, arranged in chevron-like series with the vertex on the mid-lateral line; and caudal fin in males with red bars (Ref. 76975). |
| Biology: |
Found mostly in a shallow swamp, about 10-20 cm deep, within a forest (Ref. 76975). |
| IUCN Red List Status: |
Data deficient (DD); Date assessed: 07 November 2018 Ref. (130435)
|
| Threat to humans: |
harmless |
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